Oliver Appel, biologist for the criminal technical investigations department (KTU), examines marijuana plants for research purposes in the basement of the police department in Hamburg, Germany, 13 March 2012. Investigators want to find out how much of the drug THC (Tetrahydrocannabinol) is contained in different kinds of cannibas. Photo: Angelika Warmuth

- Image ID: D6JCNA
Oliver Appel, biologist for the criminal technical investigations department (KTU), examines marijuana plants for research purposes in the basement of the police department in Hamburg, Germany, 13 March 2012. Investigators want to find out how much of the drug THC (Tetrahydrocannabinol) is contained in different kinds of cannibas. Photo: Angelika Warmuth
dpa picture alliance archive / Alamy Stock Photo
Image ID: D6JCNA

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